the position of a stone cannot change___some force outside the stone causes it to move
问题描述：
the position of a stone cannot change___some force outside the stone causes it to move
A if B when C unless Dthough
答
这道题选C
unless表示“除非”,整句话翻译成：除非在一个石头外面有力量去迫使石头移动,石头不能改变位置.
不明白的再问哟,请及时采纳,多谢!